/*
 * jQuery Iframe Transport Plugin 1.6.1
 * https://github.com/blueimp/jQuery-File-Upload
 *
 * Copyright 2011, Sebastian Tschan
 * https://blueimp.net
 *
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/MIT
 */

/* jslint unparam: true, nomen: true */
/* global define, window, document */

(function (factory) {
  'use strict'
  if (typeof define === 'function' && define.amd) {
    // Register as an anonymous AMD module:
    define(['jquery'], factory)
  } else {
    // Browser globals:
    factory(window.jQuery)
  }
}(function ($) {
  'use strict'

  // Helper variable to create unique names for the transport iframes:
  var counter = 0

  // The iframe transport accepts three additional options:
  // options.fileInput: a jQuery collection of file input fields
  // options.paramName: the parameter name for the file form data,
  //  overrides the name property of the file input field(s),
  //  can be a string or an array of strings.
  // options.formData: an array of objects with name and value properties,
  //  equivalent to the return data of .serializeArray(), e.g.:
  //  [{name: 'a', value: 1}, {name: 'b', value: 2}]
  $.ajaxTransport('iframe', function (options) {
    if (options.async) {
      var form,
        iframe,
        addParamChar
      return {
        send: function (_, completeCallback) {
          form = $('<form style="display:none;"></form>')
          form.attr('accept-charset', options.formAcceptCharset)
          addParamChar = /\?/.test(options.url) ? '&' : '?'
          // XDomainRequest only supports GET and POST:
          if (options.type === 'DELETE') {
            options.url = options.url + addParamChar + '_method=DELETE'
            options.type = 'POST'
          } else if (options.type === 'PUT') {
            options.url = options.url + addParamChar + '_method=PUT'
            options.type = 'POST'
          } else if (options.type === 'PATCH') {
            options.url = options.url + addParamChar + '_method=PATCH'
            options.type = 'POST'
          }
          // javascript:false as initial iframe src
          // prevents warning popups on HTTPS in IE6.
          // IE versions below IE8 cannot set the name property of
          // elements that have already been added to the DOM,
          // so we set the name along with the iframe HTML markup:
          iframe = $(
            '<iframe src="javascript:false;" name="iframe-transport-' +
                            (counter += 1) + '"></iframe>'
          ).bind('load', function () {
            var fileInputClones
            var paramNames = $.isArray(options.paramName)
              ? options.paramName : [options.paramName]
            iframe
              .unbind('load')
              .bind('load', function () {
                var response
                // Wrap in a try/catch block to catch exceptions thrown
                // when trying to access cross-domain iframe contents:
                try {
                  response = iframe.contents()
                  // Google Chrome and Firefox do not throw an
                  // exception when calling iframe.contents() on
                  // cross-domain requests, so we unify the response:
                  if (!response.length || !response[0].firstChild) {
                    throw new Error()
                  }
                } catch (e) {
                  response = undefined
                }
                // The complete callback returns the
                // iframe content document as response object:
                completeCallback(
                  200,
                  'success',
                  { iframe: response }
                )
                // Fix for IE endless progress bar activity bug
                // (happens on form submits to iframe targets):
                $('<iframe src="javascript:false;"></iframe>')
                  .appendTo(form)
                form.remove()
              })
            form
              .prop('target', iframe.prop('name'))
              .prop('action', options.url)
              .prop('method', options.type)
            if (options.formData) {
              $.each(options.formData, function (index, field) {
                $('<input type="hidden"/>')
                  .prop('name', field.name)
                  .val(field.value)
                  .appendTo(form)
              })
            }
            if (options.fileInput && options.fileInput.length &&
                                options.type === 'POST') {
              fileInputClones = options.fileInput.clone()
              // Insert a clone for each file input field:
              options.fileInput.after(function (index) {
                return fileInputClones[index]
              })
              if (options.paramName) {
                options.fileInput.each(function (index) {
                  $(this).prop(
                    'name',
                    paramNames[index] || options.paramName
                  )
                })
              }
              // Appending the file input fields to the hidden form
              // removes them from their original location:
              form
                .append(options.fileInput)
                .prop('enctype', 'multipart/form-data')
              // enctype must be set as encoding for IE:
                .prop('encoding', 'multipart/form-data')
            }
            form.submit()
            // Insert the file input fields at their original location
            // by replacing the clones with the originals:
            if (fileInputClones && fileInputClones.length) {
              options.fileInput.each(function (index, input) {
                var clone = $(fileInputClones[index])
                $(input).prop('name', clone.prop('name'))
                clone.replaceWith(input)
              })
            }
          })
          form.append(iframe).appendTo(document.body)
        },
        abort: function () {
          if (iframe) {
            // javascript:false as iframe src aborts the request
            // and prevents warning popups on HTTPS in IE6.
            // concat is used to avoid the "Script URL" JSLint error:
            iframe
              .unbind('load')
              .prop('src', 'javascript'.concat(':false;'))
          }
          if (form) {
            form.remove()
          }
        }
      }
    }
  })

  // The iframe transport returns the iframe content document as response.
  // The following adds converters from iframe to text, json, html, and script:
  $.ajaxSetup({
    converters: {
      'iframe text': function (iframe) {
        return iframe && $(iframe[0].body).text()
      },
      'iframe json': function (iframe) {
        return iframe && $.parseJSON($(iframe[0].body).text())
      },
      'iframe html': function (iframe) {
        return iframe && $(iframe[0].body).html()
      },
      'iframe script': function (iframe) {
        return iframe && $.globalEval($(iframe[0].body).text())
      }
    }
  })
}))
